%0 Journal Article
%A Stein, J.
%A Caissy, R.
%A Plamondon, A.P.
%A Bernier, P.Y.
%T Estimation of potential evapotranspiration with shallow lysimeters in a forest tree nursery
%B Forestry Chronicle
%D 1995
%V 71
%P 755-758
%N 6
%X Daily evapotranspiration values (ET(L)) were obtained during three
consecutive summers from water balance measurements on eight shallow
drainable lysimeters in similarly planted nursery beds of either
white spruce [Picea glauca (Moench) Voss] or black spruce [Picea
mariana (Mill) B.S.P.]. Values of ET(L) and of potential evapotranspiration
(PET), calculated with the Penman equation, were nearly equal for
most of the sampled days during the first two years. During the
last year of study, the ratio ET(L)/PET was reduced to 0.8 due to
a lack of water input (precipitation and irrigation) to the lysimeters.
Water balance measurements from the surrounding seedling beds showed
that values of actual evapotranspiration (AET) for the first two
years were 0.61 times those of either PET or ET(L). Rates of evapotranspiration
in the lysimeters remained high because of the high water contents
in the shallow lysimeters induced by the presence of a zero tension
plane at the base of the lysimeters, above the drainage holes. Results
indicate that well-watered shallow lysimeters can be used to estimate
values of PET and be used directly for the purpose of driving water
balance models for irrigation scheduling.
%K water relations; irrigation scheduling; lysimeters; evapotranspiration;
white spruce; black spruce WATER-BALANCE; SOIL
%# brugerolles
%Z timestamp=(2007.12.05)
%F SteinCaissyPlamondonEtAl1995
%3 BibTeX type = ARTICLE